Electrocatalysis of As(III) oxidation by cobalt oxide nanoparticles: measurement and modeling the effect of nanoparticle amount on As(III) oxidation potential

Coneo-Rodríguez, Rusbel; Baena-Moncada, Angélica M.; Acevedo, Diego F.; Morales, Gustavo M.; Planes, Gabriel A.; Barbero, C.

doi:10.1007/s10008-017-3842-6

Cited by 2 publications

(5 citation statements)

References 57 publications

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“…to prepare the working electrode, the electrodeposition of a cobalt oxide film on GC electrode was performed. 35 The cobalt oxide deposition on the electrode surface produced a current increasing during electrochemical cycling by oxide layer growth as can be observed in Figure 5A. At the anodic scan, the oxidation of cobalt ions (Co 2+ ) produces CoO x species, such as Co(OH) 3, CoOOH and Co 3 O 4 which are insoluble at the working pH 7.0 and are deposited on the electrode surface.…”

Section: Generation Of the Modified Electrode To Detect Arsenic-in Ordermentioning

confidence: 95%

“…The results show that the obtained modified electrode has a similar response to those reported by other authors in aqueous solutions. 34,35 The electrochemical behavior of the modified electrode showed a good sensitivity to arsenic concentration around maximum permissible according to Argentine legislation. 15 In the following section, the electrochemical performance of this electrode in physical contact to the gel is shown.…”

Section: Generation Of the Modified Electrode To Detect Arsenic-in Ordermentioning

confidence: 98%

“…solution) electrode as a reference (RE). 35 The electrode was cycled for 15 cycles in order to obtain the modified electrode. The electrodeposited cobalt oxide film on GC electrode were characterized by scanning electron microscopy (SEM) (Carl Zeiss-EVOMA10) at low vacuum and low field and by atomic force microscopy (AFM) (Agilent Technologies-SPM model 5500) working in acoustic mode, using a probe (Micromasch, HQ:XSC11/A1 BS) with a cantilever resonance frequency and force constant of 350 kHz and 42 N • m −1 , respectively.…”

Section: Properties Of Hydrogel Matrix: Swelling Kinetic and Swelling...mentioning

confidence: 99%

“…The electrochemical response of our modified electrode, showed an increasing in the peak current in presence of arsenic, respect to blank (in absence of As), as a consequence of electro-oxidation of arsenic (III) to arsenic (V). 34,35 The oxidation peak for arsenic was observed at ca. 1.03 V (vs Ag/AgCl) (Figure 6).…”

Section: Generation Of the Modified Electrode To Detect Arsenic-in Ordermentioning

confidence: 99%

“…[22][23][24][25][26][27] Regards electrochemical arsenic detection nanostructured materials such as noble metal, metal oxide nanoparticle-modified electrodes, [28][29][30] carbon nanoparticlemodified electrodes (carbon nanotube/graphene), 31,32 and bimetallic nanoparticle-modified electrodes 33 have been demonstrated good sensibility due to their catalytic properties and roughening of the conductive sensing interface. Recently, we have demonstrated that modified electrodes with cobalt oxide nanoparticles 34,35 present excellent performance toward arsenic oxidation over a wide pH range (5 to 11). Based in the precedent antecedents, taking the advantage of the electrochemical techniques (involving modified electrodes with cobalt oxide nanoparticles) 36,37 and the gels ability to load compounds, in this research work an effortless method to detect arsenic in real samples with high sensitivity is described.…”

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confidence: 99%

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Simple Electrochemical Detection Method Employing a Hydrogel Soft Matrix: Application in Tap Water

Martínez¹,

Rodríguez²,

Bruno³

et al. 2018

J. Electrochem. Soc.

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The proposed method implies the electrochemical detection of an analyte preloaded in a hydrogel. In order to evaluate the potential application of this method, arsenic detection in tap water was performed. Polymeric hydrogels bearing cationic groups poly(Nisopropyacrylamide)-co-3-(acrylamidopropyl)trimethylammonium chloride were used to sorb arsenic ions, at basic pH, from the real and synthetic stock samples. The concentration of arsenic was electrochemically determined using the loaded hydrogel and a modified glassy carbon electrode. Employing a cationic hydrogel, the peak current for the arsenic oxidation was ca. 8 times higher than the peak current measured using poly(N-isopropyacrylamide), a neutral hydrogel, indicating a strong electrostatic interaction between the polymeric cationic groups and arsenite anions. By using this method, values of arsenic comparable to those measured by Atomic Absorption Spectroscopy were obtained for tap water of small cities in Argentina. These results suggest that this new and easy method is suitable to sense a threshold limit of arsenic in real samples since the features of the hydrogel allow the arsenite loading into the matrix. Besides the cationic hydrogels could be employed to sampling on-field and to build a portable analysis system.

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Section: Generation Of the Modified Electrode To Detect Arsenic-in Ordermentioning

confidence: 95%

Section: Generation Of the Modified Electrode To Detect Arsenic-in Ordermentioning

confidence: 98%

Section: Properties Of Hydrogel Matrix: Swelling Kinetic and Swelling...mentioning

confidence: 99%

Section: Generation Of the Modified Electrode To Detect Arsenic-in Ordermentioning

confidence: 99%

mentioning

confidence: 99%

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Simple Electrochemical Detection Method Employing a Hydrogel Soft Matrix: Application in Tap Water

Martínez¹,

Rodríguez²,

Bruno³

et al. 2018

J. Electrochem. Soc.

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{Co4O4} Cubanes in a conducting polymer matrix as bio-inspired molecular oxygen evolution catalysts

Li,

Zhang,

Marks

et al. 2024

Nat Commun

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Exploration of efficient molecular water oxidation catalysts for long-term application remains a key challenge for the conversion of renewable energy sources into fuels. Cuboidal {Co 4 O 4 } complexes keep attracting interest as molecular water oxidation catalysts as they combine features of both heterogeneous and homogeneous catalysis with bio-inspired motifs. However, the application of many cluster-based catalysts for the oxygen evolution reaction still requires new stabilization strategies. Drawing inspiration from the stabilizing effects of natural polymers, we introduce a conductive polymer-hybrid approach to covalently immobilize {Co 4 O 4 } cubane oxo clusters as oxygen evolution catalysts. Polypyrrole is applied as an efficient p -type conducting polymer that promotes hole transfer during the oxygen evolution reaction, resulting in higher turnover frequency compared to the pristine {Co 4 O 4 } oxo cluster and heterogeneous Co-oxide benchmarks. The asymmetric coordination of {Co 4 O 4 } not only mitigates catalyst decomposition pathways, but also increases the catalytic efficiency by exposing a directed cofacial dihydroxide motif during catalysis.

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Electrocatalysis of As(III) oxidation by cobalt oxide nanoparticles: measurement and modeling the effect of nanoparticle amount on As(III) oxidation potential

Cited by 2 publications

References 57 publications

Simple Electrochemical Detection Method Employing a Hydrogel Soft Matrix: Application in Tap Water

Simple Electrochemical Detection Method Employing a Hydrogel Soft Matrix: Application in Tap Water

{Co4O4} Cubanes in a conducting polymer matrix as bio-inspired molecular oxygen evolution catalysts

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